Abstract: Mobile internet and cloud computing provide a development platform for mobile knowledge service of digital li- brary. Starting from mobile cloud, this paper discusses the application of cloud computing in digital library knowledge service in wireless network environment. Taking the end, tube, cloud as the main line, it gives the knowledge service system model of digital librarye based on mobile cloud from the aspect of the data collection, processing and using, analyzes the operation of this model, points out opportunities and challenges of mobile cloud services, and gives the strategy and method of the knowledge cloud service.

Key words: mobile cloud; digital library; mobile device;knowledge service